ABSTRACT: It is often claimed that the racially biased Immigration Act of 1924 was passed with the help of the intelligence testing community of the period. The claim consists of two components: first, that the intelligence testing community saw its test data on social and ethnic differences as favoring a discriminatory immigration policy and, second, that Congress relied to some significant extent on the testing community and/or its data. An examination of the historical record failed to uncover any support for either component of the claim. The testing community did not generally view its findings as favoring restrictive immigration policies like those in the 1924 Act, and Congress took virtually no notice of intelligence testing, as far as one can ascertain from the records and publications of the time.